Add some kind of replicate option to wekaMine

[jdurbin]

Should be incompatible with foldsets as input.

Repeat experiment n-times with different CV folds. Simple command line option? This would let us get distributions on the performance of various algorithms.

[jdurbin]

wmGenFolds partially handles this now with the -x foldRepetitions option. Need to put similar option into wekaMine itself. Also need to verify what happens when pass multiple repetitions to wekaMine what it does in the output. It should report the calls for all samples across repetitions. Does it?